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    <center>Scilab Function</center>
    <div align="right">Last update : April 1993</div>
    <p>
      <b>boucle</b> -  phase portrait of a dynamical system with observer</p>
    <h3>
      <font color="blue">Calling Sequence</font>
    </h3>
    <dl>
      <dd>
        <tt>[]=boucle(fch,[abruit,xdim,npts,farrow])  </tt>
      </dd>
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    <h3>
      <font color="blue">Parameters</font>
    </h3>
    <ul>
      <li>
        <tt>
          <b>fch</b>
        </tt>: Scilab macro. <tt>
          <b>fch</b>
        </tt> is supposed to be an observed-controlled system with  noisy output of state dimension 4 ( [x;xchap] is of dimension 4). <tt>
          <b>fch</b>
        </tt> can be created with the macro <tt>
          <b>obscont1</b>
        </tt> or can be set to one of the two following string which gives pre computed examples<ul>
          <li>
            <tt>
              <b>"bcomp"  </b>
            </tt>: for a non-linear competition model.</li>
          <li>
            <tt>
              <b>"lcomp"  </b>
            </tt>: for a linear example.</li>
        </ul>
      </li>
      <li>
        <tt>
          <b>abruit</b>
        </tt>: give the noise variance.</li>
      <li>
        <tt>
          <b>xdim,npts,farrow</b>
        </tt>: See portrait</li>
    </ul>
    <h3>
      <font color="blue">Description</font>
    </h3>
    <p>
    Phase portrait of dynamical systems.</p>
    <h3>
      <font color="blue">See Also</font>
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    <p>
      <a href="portrait.htm">
        <tt>
          <b>portrait</b>
        </tt>
      </a>,&nbsp;&nbsp;<a href="../nonlinear/ode.htm">
        <tt>
          <b>ode</b>
        </tt>
      </a>,&nbsp;&nbsp;<a href="obscont1.htm">
        <tt>
          <b>obscont1</b>
        </tt>
      </a>,&nbsp;&nbsp;</p>
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